I have a pea sized red bump with a yellow centre on my inner labia minora. pimple or sebaceous cyst? it popped but the yellow centre came back.

Bartholin Cyst: Most cysts can be removed in the office with local anesthesia. However, a Bartholin cyst may require a facility like an outpatient surgery center for proper removal. These cysts are located along labia, a very sensitive area. Okay to get in to see a local Gynecologist. Take a friend or family with you. Be well.

Cyst?: A recurrent lesion like this, if in the same spot each time, suggests a cyst, e.g. a blocked sebaceous or mucus gland. (You seem to ve aware of this possibility, since you selected 3 different kinds of cyst among your topic tags.) Best to see a doctor; minor surgery (opening it to drain, perhaps cautery) probably would prevent future recurrences.